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Full text of "Monthly performance report : Saddle Hill trust lot 77"

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SOLAR/1040-79/04 

Monthly 

Performance 

Report 

SADDLE HILL TRUST 

LOT 77 

APRIL 1979 








U.S. Department of Energy 



National Solar Heating and 
Cooling Demonstration Program 

National Solar Data Program 



i 



NOTICE 

This report was prepared as an account of work sponsored by the United States 
Government. Neither the United States nor the United States Department of Energy, nor 
any of their employees, nor any of their contractors, subcontractors, or their employees, 
make any warranty, express or implied, or assume any legal liability or responsibility for 
the accuracy, completeness or usefulness of any information, apparatus, product or 
process disclosed, or represents that its use would not infringe privately owned rights. 



MONTHLY PERFORMANCE REPORT 

SADDLE HILL TRUST 
LOT 77 

APRIL 1979 



I. SYSTEM DESCRIPTION 

Saddle Hill Trust Lot 77 is a single- family residence in Medway, Massachusetts. 
Solar energy is used for preheating incoming city water. The solar energy 
system has an array of flat-plate collectors with a gross area of 78 square 
feet. The array faces south at an angle of 38 degrees to the horizontal. Air 
is used as the medium for delivering solar energy from the collector array to 
an air-to-liquid heat exchanger located in the collector air duct. Water is 
the medium used to transport solar energy from the heat exchanger to storage. 
Solar energy is stored in the basement in a 120-gallon preheat storage tank. 
This preheated city water is supplied, on demand, to a conventional 40-gallon 
domestic-hot-water (DHW) tank. When solar energy is insufficient to satisfy 
the hot water requirements, the gas-driven DHW heater provides auxiliary 
energy for water heating. The system, shown schematically in Figure 1, has 
two modes of solar operation. 

M ode 1 - Col lector- to-Storage : This mode activates when the difference be- 
tween the temperature of the collector air and the temperature of the water in 
the preheat tank exceeds 40°F and the temperature of the water in the tank is 
below 140°F. Both the fan and pump go on. This mode continues until the 
temperature difference drops to 20°F. 

Mode 2 - Storage-to-Space Heating : This mode activates when there is a demand 
for hot water. Hot water from the top of the preheat tank is transferred to 
the DHW tank to replace water removed. Simultaneously, city water is auto- 
matically supplied to the preheat tank. 

II. PERFORMANCE EVALUATION 



INTRODUCTION 

The site was occupied in April and the solar energy system operated continuously 
during the month. Solar energy satisfied 33 percent of the DHW requirements. 
The solar energy system provided fossil fuel energy savings of 1.0 million Btu 
and incurred an electrical energy expense of 0.12 million Btu. 

WEATHER CONDITIONS 

During the month, total incident solar energy on the collector array was 2.9 
million Btu for a daily average of 1239 Btu per square foot. This was below 
the estimated average daily solar radiation for this geographical area during 
April of 1372 Btu per square foot for a south-facing plane with a tilt of 



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42 degrees to the horizontal. The average ambient temperature during April 
was 47°F as compared with the long-term average for April of 49°F. 

THERMAL PERFORMANCE 

System - During April the solar energy system performed approximately the same 
as expected. The expected performance was determined from a modified f -chart 
analysis using measured weather and subsystem loads as inputs. Solar energy 
collected was 0.87 million Btu versus an estimated 0.69 million Btu. Solar 
energy used by the system was estimated by assuming that all energy collected 
would be applied to the load. Actual solar energy used was 0.67 million Btu. 
System total solar fraction was 33 percent versus an estimated 32 percent. 

Collector - The total incident solar radiation on the collector array for the 
month of April was 2.9 million Btu. During the period the collector loop 
was operating the total insolation amounted to 2.4 million Btu. The total 
collected solar energy for the month of April was 0.87 million Btu, resulting 
in a collector array efficiency of 30 percent, based on total incident insola- 
tion. Solar energy delivered from the collector array to the DHW subsystem 
amounted to 0.67 million Btu. Energy loss during transfer from the collector 
array to the DHW subsystem was 0.20 million Btu. This loss represented 23 
percent of the energy collected. Operating energy required by the collector 
loop was 0.12 million Btu. 

DHW Load - The DHW subsystem consumed 0.67 million Btu of solar energy and 2.5 
million Btu of auxiliary fossil fuel energy to satisfy a hot water load of 
1.8 million Btu. The solar fraction of this load was 33 percent. Losses 
from the DHW subsystem were 0.37 million Btu. A daily average of 73 gallons 
of DHW was consumed at an average temperature of 141°F delivered from the tank. 

OBSERVATIONS 

The losses from the DHW subsystem were partly attributed to the relatively high 
DHW average temperature of 141°F. 

ENERGY SAVINGS 

The solar energy system provided a fossil fuel energy savings of 1.0 million 
Btu and incurred an electrical energy expense of 0.12 million Btu. 

III. ACTION STATUS 

No action is required at this time. 



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UNIVERSITY OF FLORIDA 

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